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Showing 5 results for Electromyography
Elham Tavassoli, Dr Firoz Gadrei Pakdel , Dr Samad Zareh, Dr Mosa Tavassoli ,
Volume 22, Issue 2 (5-2011)
Abstract

  

  Background & Aims : Sixty nine species of ticks in order Metastigmata may cause tick paralysis. A neurotoxin, which is found in tick salvia, is believed to be responsible for the paralysis. About 4-5 days after tick attachment paralysis occurs. The cause of the paralysis is blockage of transmission at the neuromuscular junction, due to the reduction of release of acetylcholine, and / or interaction in acetylcholine synthesis. There are differences in the clinical symptoms of paralysis produced by ticks. Generally, it is identified by a flaccid, ascending, acute & a febrile paralysis of limbs. Respiratory failure is the common cause of the death in tick paralysis. Recovery depends on the stage of paralysis. In mild forms recovery is rapid & which follows tick removal.

  Materials & Methods : This survey was tried to determine the capacity of Ornithodoros lahorensis ticks in producing tick paralysis in rat. After collection of O. lahorensis from infested farms and kept them in laboratory condition, 6 male rats were infested with female adult and larval ticks separately. After two weeks clinical, physical and electromyographical examinations were done.

  Results: The results indicated no sign of paralysis in physical and clinical examination in two groups of rats (infested to adult and larva ticks). Also the electromyography in infested rats was normal.

  Conclusion: O . lahorensis cann ot produce paralysis in rat.

  Source: Urmia Med J 2011: 22(2): 162 ISSN: 1027-3727


EFFECT OF GAIT TRAINING ON ANKLE JOINT CO-CONTRACTION IN DIABETIC PATIENTS WITHOUT NEUROPATHY
Milad Alipour Sari Nasirloo, Aydin Valizadeh Orang, Amirali Jafarnezhadgero, Marefat Siahkohian,
Volume 33, Issue 4 (7-2022)
Abstract
Background & Aims: Diabetes is related to dysfunction and damage of various organs, especially blood vessels, nerves, and heart. The aim of this study was to evaluate the effect of gait training on ankle joint co-contraction in diabetic patients with without neuropathy.
Materials & Methods: The method of the present study was quasi-experimental. The statistical population of the present study included 24 people who were randomly and equally divided into experimental and control groups, 12 in each. The experimental group performed walking exercises for 8 weeks and the control group did not do any activity during this period. To calculate the general and directed co-contraction, first the electromyography activity of the Gastrocnemius and tibialis anterior muscles was recorded by an 8-channel electromyography device (Bio System, UK) with a surface electrode. Biometrics Data LITE software and a filter pass between 10 and 450 Hz was used to record. To normalize the electromyography signals, the root mean square (RMS) information of each muscle was divided by the maximum isometric maximum co-contraction of that muscle to normalize the data and then multiplied by one hundred. Then, the data of the two groups were statistically analyzed by two-way analysis of variance using SPSS software version 24.
Results: The results showed that the general co-contraction during the loading phase in the experimental group in the post-test phase increased significantly compared to the pre-test. There was a significant decrease in the experimental group compared to the pre-test group in mean directed co-contraction during loading phase (p = 0.001), support (p <0.001), toe off (p = 0.008) and swing (p = 0.001) and was close to zero.
Conclusion: The results of the present study showed that gait Trainings are effective on general and directional ankle joint co-contraction in diabetic patients without neuropathy, and increased co-contraction in the ankle joint, which can have beneficial effects on joint stability during walking.
COMPARISON OF MUSCULAR FREQUENCY CONTENT IN HEALTHY CHILDREN AND CHILDREN WITH OVERACTIVE/ATTENTION DEFICIENT DURING WALKING
Amirali Jafarnezhadgero, Mina Salem, Ehsan Fakhri Mirzanag,
Volume 33, Issue 7 (10-2022)
Abstract
Background and Aim: Attention deficit/hyperactivity disorder is a common neurocognitive disorder that has been one of the most extensive research fields and also one of the largest sources of referrals to mental health centers in recent decades. The aim of the present study was to compare muscular frequency content in healthy children and children with overactive/attention deficient during walking.
Material and Methods: The present study was a case-control type. The statistical sample included 20 boys with attention deficit/hyperactivity disorder and 20 healthy boys with an age range of 7-9 years, who were selected by convenient sampling method. A bipolar EMG system with 8 paires of electrodes was used to record EMG data of tibialis anterior, medial gastrocnemius, vastus medialis, vastus lateralis, rectus femoris, biceps femoris, and gluteus medius while walking. Independent sample t-test was used for statistical analysis.
Results: The results indicated that the frequency of the medial gastrocnemius muscle during the loading phase is higher in the hyperactive group than the healthy group (p<0.001). Also, results demonstrated that frequency continent of vastus medialis during loading phase and frequency continent of gluteus medius during mid-stance phase were lower in overactive group than healthy group (p<0.001).
Conclusion: Lower vastus medialis and gluteus medius activities in overactive group may be due to weal postural control in sagittal and frontal planes.
 
Comparison of frequency of electrical activity values of lower limb muscles before and after fatigue in people with history of covid-19 compared to healthy people during walking
Amirali Jafarnezhadgero, Zeinab Noroozi, Ebrahim Piri,
Volume 34, Issue 8 (11-2023)
Abstract
Background & Aims: Fatigue is one of the effective factors in changing the electrical activity of muscles, so that this index is directly related to the increase in the potential of muscle injuries and performance loss in various sports stages. Therefore, the aim of the present study was to compare the electrical activity values of the lower limb muscles before and after fatigue in the people with a history of Covid-19 compared to healthy people during walking.
Materials & Methods: The present research was of semi-experimental and laboratory one. The statistical population of the present study included women with a history of Covid-19 and healthy women in Ardabil province. A statistical sample of 28 people with an age range of 18-30 years was selected by purposive sampling. The statistical samples included two groups of 14 healthy people and 14 people with covid-19. The method of asking people for their history of contracting the Covid-19 disease was in such a way that at least two months had passed from their infection and their PCR test results were already positive. healthy people didn't have any symptoms and had negative PCR results. Electromyography data were analyzed using Datalite Biometric program before and after the fatigue protocol. Two-way analysis of variance (ANOVA) with repeated measures was used for statistical analysis, and bonferroni post hoc test was used at the significance level of P<0.05.
Results: The results showed significant group-by-fatigue interaction effect for frequency of the vastus latlarais (P=0.031), vastus medialis (P=0.029), and gluteus medius (P=0.035) muscles during loading response phase. The reduction of frequency content at post-test compared with pre-test in healthy group was greater than that Covid-19 group.
Conclusion: It seems that the difference in the frequency of electrical activity of the muscles of the lower limbs in different phases of walking after fatigue in people with Covid-19 compared to healthy ones can be a serious reason for the occurrence of injury and decrease in the stability of the joints during walking. However, more confirmatory researches in the future are needed to prove this relationship.


 
ANKLE JOINT CO-CONTRACTION IN INDIVIDUALS WITH HEALTHY AND SUPINATED FEET DURING WALKING ON ARTIFICIAL TURF AND STABLE GROUND
Amirali Jafarnezhadgero, Arezo Madahi, Ehsan Fakhri Mirzanag,
Volume 34, Issue 9 (12-2023)
Abstract
Background & Aim: Different surfaces have different effects on body mechanics during walking. The aim of this study was to evaluate ankle joint co-contraction in individuals with healthy and supinated feet during walking on artificial turf and stable ground.
Material & Methods: This study was a semi-experimental and laboratory one. The statistical population included 10 individuals with supinated feet (mean age of 22.1± 2.2 years) and 10 individuals with healthy feet (mean age of 24.2± 3.3 years). The electrical activity of selected lower limb muscles was recorded using electromyography system during walking. Two ways ANOVA with repeated measure test was used for statistical analysis using SPSS 20 software at significant level of 0.05.
Results: Results showed that the main effect of surface (P=0.035) and group (P=0.000) on general ankle co-contraction was significant during loading phase. General ankle co-contraction during loading phase while walking on artificial turf was greater than walking on the ground. Differences between other directional and general co-contraction components in other phases during walking on artificial turf and stable ground were not significant (P<0.05).
Conclusion: General co-contraction values of muscles during walking on artificial turf were greater than walking on the stable ground. Increased general co-contraction may be associated with instability of the surface. Nevertheless, to prove this as well as possible, it is necessary to conduct more research in the future with larger statistical populations.
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